Feed watee heater foe steam boilees



(No Model.) r s Sheets-Sheet 1.

J. BAIRD. FEED WATER HEATER FOR STEAM BOILERS.

No. 460,839. Patented Oct. 6, 1891.

m: mums Pnzns 00., mom-mum, msnmum, n. c,

(No Model.) 3 Sheets-Sheet 2. J. BAIRD.

FEED WATER HEATER FDR STEAM BOILERS. No. 460,839. Patented 0ct.6, 1891.

7 5- ON Luv]: 2 -2 Invemr JO/l/V 314/00 s kwwwwwuw (No Model.) 3Sheets-Sheet 3.

J. BAIRD. FEED WATER HEATER FOR STEAM BOILERS. No. 460.839.

Patented 0011.6,1891.

Inverzlor l/Ol/N 84/51) by 7:16 ail'brngs QQWLDMLW \1 WW- UNTTnn STATESA PATENT OFFICE.

JOHN BAIRD, OF NElV YORK, N. Y.

FEED-WATER HEATER FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 460,839, dated October6, 1891.

Application filed April 13, 1891.

T0 aZZ whom it may concern.-

Be it known that I, JOHN BAIRD, mechanical engineer, a citizen of theUnited States, residing at No. 824: Lexington avenue, in the city,county, and State of New York, haveinvented certain new and usefulImprovements in Feedater Heaters for steam Boilers, of which thefollowing is a specification.

My invention more especially relates to feed-water heaters forsteam-boilers of the class having horizontal or slightly-inclined fines.Its object is to secure a compact and efficient boiler adapted to makeample steam of high pressure in a comparatively small space, which endsI attain by certain novel organizations of instru men talitieshereinafter specified.

The accompanying drawings show my improvements adapted to alocomotive-boiler exemplified in United States Letters Patent No.54,973, granted to me August 26,1890, representing, however, so muchonly of the apparatus as is necessary to illustrate the subject-matterclaimed. Unless otherwise indicated the parts are of usual approvedconstruction and ordinary operation.

Figure 1 is a plan, and Fig. 2 a vertical central longitudinal sectionon the line 2 2 of Figs. 1 and 3. Fig. 3 is a front elevation; Fig. at,a vertical transverse section on the line 4 4 of Fig. 1, and Fig. 5 asimilar view on the line 5 5 thereof.

Short unfeathered darts indicate the directions in which the sectionsare shown, dotted arrows show the direction of the water-circulation,and solid arrows the course of the products of combustion.

The fire-box end of the boiler I term the front; the opposite, the backor rear end. That side on the left of a person facing the fire-box Icall the left, the opposite, the right.

A firebox A, provided with gratebars ct,is shown as connected by a backhead I with the front tube-sheet of the lower shell B, through thefire-tubes b of which the products of combustion pass into the uptake Aand chimney A The front or feed-door end of the boiler is composed oftwo parallel sheets of metal constituting a front head or water-space D,provided with tire-doors (7.

Serial No. 388,658. (No model.)

The sides and top of the fire-boXcons-ist of a series of transversearched water-tubes C,

.placed close together side by side and exupper ends with the front headand extend .ing backward to a point, say, about threefourths of thedistance between the front and back heads, where they are bent downward,reaching to the bottom of the fire-box, their lower ends being connectedby small pipes f to the water-leg at the bottom of the tubesheet. thefire-box, so as to afford access at each side to the front connection ofthe tube-sheet. These tubes preferably lie in front of the firetubes.

The iire-box,itwill be observed, is wider than the lower shellof theboiler, and the upper portion of the space obtained by this increasedwidth is utilized by arranging therein longitudinal water-tubes II,connecting the front head with the tube-sheet or back head I, they beingpreferably connected to the inner sheet of the front head and passingthrough packed water' tight sleeves in the back head with which they areconnected by small tubes h, as shown in United States Letters Patent No.425,970, grautedto me April 22, 1890. An upper shell K is shown asextending over the fire-box and lower shell. It is connected with thefront head by pipes J,

These tubes are arran ed centrall in for the passage of mingled steamand water mentioned, the steam rises through the water in the uppershell to its steam-space in the upper part thereof. The front head D andwater-boxes E are connected by suitable staybolts 6 to resistlongitudinal strains.

IOO

The organization above described is substantially that of my PatentNo.4=34,97 3 above mentioned.

In order to carry out my present invention, I lengthen the uptake orsmoke-box A and surround it with a double shell, constituting awater-space M, into the left-hand side of which the feed-water is shownas flowing througha pipe m, provided with a check-valve m. A pipe mconnects the upper part of the opposite side of this water-space with awater-box N, extending transversely across the uptake about or above thenormal water-line of the upper shell. A series of pendent open-endedtubes at are shown as arranged in two parallel rows across the uptakeand is inclosed in larger. concentric tubes 02, closed at their lowerends but connected at their upper ends with lower channels N, connectedwith the upper part of the lower shell by the water-inlet pipes N whichenter opposite sides of the boiler. The products of combustion, it willbe observed, in passing through the back connectionor uptake impingeagainst theinner walls of the waterspace M and circulate freely amongthe pendent water-tubes before escaping up the chimney, thus thoroughlyheating the feed-water.

The boiler is of course to be supplied with the most approvedappliances, including safety-valves,-st-eam, water, and air passages,and

valves for filling, working, and emptying the I boiler.

I do not broadly claim herein the combination, with boiler-fines, ofpendent watertubes, as similar devices are described and claimed insundrypending applications heretofore filed by me, as follows: SerialNo. 383,096, filed February 27, 1891; Serial No. 383,854,1i1ed March5,1891; Serial No. 384,736, filed March 12, 1891; Serial No. 386,335,filed March 25, 1891, and Serial No. 387,747, filed April 6,1891.

I claim as of my own invention- 1. lhe'combination, substantially ashereinbefore set forth, of a boiler-shell, its firetubes, its backconnection or uptake, a waterspace inclosing it through which thefeedwater flows, an upper channel, a lower channel, feedwater-circulation pipes pendent therefrom in the uptake, a water-passageconnecting the water-space and channels, and feed-water pipes connectingthe channels and boiler.

2. The combination, substantially as hereinbefore set forth, of afire-box, a boiler-shell directly in rear thereof, its fire-tubes, anuptake or back connection into which they open, a feed-water spacesurrounding the uptake, channels extending transversely over the up"-take at or above the normal Water-line of the .boiler, pendentconcentric water-circulating pipes connecting the channels, and wateringacross the back connection, concentric pendent feed-water-circulationtubes in the uptake or back connection connecting said channels, andwater-passages connecting the water-space and channels with the lowerboiler-shell.

In testimony whereof I have hereunto subscribed my name.

JOHN BAIRD. Witnesses:

ADDISON W. BAIRD, THOMAS BAIRD.

